设f(x,y)==__________.

admin2016-11-03  11

问题 设f(x,y)==__________.

选项

答案一2e-x2y2

解析 =ye-x2y2,因f(x,y)具有对称性,故得到=xe-x2y2
同理,由=-2xy3e-x2y2及对称性得到=-2x3ye-x2y2
=e-x2y2一2x2y2e-x2y2,故
=-2e-x2y2
转载请注明原文地址:https://jikaoti.com/ti/DKwRFFFM
0

最新回复(0)